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@ARTICLE{Weber:836132,
author = {Weber, Juliane and Barthel, Juri and Klinkenberg, Martina
and Bosbach, Dirk and Kruth, Maximilian and Brandt, Felix},
title = {{R}etention of $^{226}${R}a by barite: {T}he role of
internal porosity},
journal = {Chemical geology},
volume = {466},
issn = {0009-2541},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2017-05255},
pages = {722-732},
year = {2017},
abstract = {The role of internal macropores and nano-scale pores for
the uptake of 226Ra into barite was studied via scanning and
transmission electron microscopy as well as focused ion beam
methods. A temporal evolution of the internal microstructure
and the Ra distribution was observed on samples taken from
long-term Ra uptake experiments. The results of this study
clearly show a significant impact of the presence of Ra
leading to a complete reconstruction of the internal barite
microstructure, whereas the microstructure of Ra-free
reference samples remained unchanged. The initial internal
barite microstructure contains a connected network of
macropores and a layered structure of nano-scale pores
which, in the presence of Ra, coalesced in favor of larger
pores during the experiment. A clear relationship between
the Ra uptake and the internal porosity was observed by
high-resolution STEM-EDX mappings. Starting from strongly
enhanced Ra concentrations in the solid in the vicinity of
the pores, Ra is temporarily inhomogeneously distributed
within the barite particles. At later stages of the
long-term experiment the Ra distribution becomes homogenous
while nano-scale and macro-scale pores disappear. In
conclusion, the uptake of Ra into barite takes place by a
special case of dissolution/reprecipitation from the inside
of the particle to the outside.},
cin = {IEK-6 / ER-C-2},
ddc = {550},
cid = {I:(DE-Juel1)IEK-6-20101013 / I:(DE-Juel1)ER-C-2-20170209},
pnm = {161 - Nuclear Waste Management (POF3-161) / HITEC -
Helmholtz Interdisciplinary Doctoral Training in Energy and
Climate Research (HITEC) (HITEC-20170406)},
pid = {G:(DE-HGF)POF3-161 / G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000407861200057},
doi = {10.1016/j.chemgeo.2017.07.021},
url = {https://juser.fz-juelich.de/record/836132},
}